I replaced all the spark plugs about 3 weeks ago. The car started up and ran fine. The next week I changed out the spark plug wires. I had started the car up and had it running before I changed out the wires. As soon as the new ones were on, it refused to start. I checked my firing order, and it is correct. I even looked it up online and it still won't start. I thought perhaps it was my distributor. So I went and replaced it, today actually. And still, it refuses to start. The engine turns over just fine, just does not attempt to fire. Any ideas?